lime query

i have a chance of free builders lime. the type they use on building sites.is it o,k to use on my allotment for brassicas. as i am riddled with club root. i am worried it could kill my worm population.any help please.mick.

Builders lime is also know as hydrated lime and can be used in place of garden lime (which is basically ground limestone.) You have to be a bit more careful when spreading it as the dust is an irritant, so make sure you don't breath it in, keep it off skin and protect eyes. Builders lime is about half as strong again as garden lime when it comes to its acid-neutralising properties, so you only need to use two thirds as much as you would if spreading garden lime.